The heart races. Breaths come short and shallow. I can feel the hairs on the back of my neck standing up, and there's a tremor in my hands.

Scary movies will do that to you.

But this is no Halloween shocker, no edge-of-your-seat thriller. It's a documentary that has dredged up fears left long dormant in the watery depths of my subconscious. Terror of confined spaces. Of drowning. Of dying hundreds of metres below ground. Of never seeing the sky again.

Deeper , the story of Dr Richard Harris's record-breaking cave dive in New Zealand, is not for the faint-hearted. Claustrophobes like me should approach it with caution, lest they run screaming from the theatre.

Remember Harris? He was the Australian anaesthetist and cave diver instrumental in the rescue of the Thai schoolboys trapped un

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